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680 <br /> City.CA <br /> (650)364-9600 FAX(650� 364-9233 <br /> Sequoia 404 N.Wlget Lane Drive <br /> Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1555 Industrial IIRoad North,Ste. d San 1uma,CA 94954 Carlos,CA 94070-41 1 1 (600)232-9600 FAX 16865 FAX 050) 232-9642 <br /> SECOR Intemational Project: ARCO 4493,Stockton,CA Sampled: 2/10/99 to 2/12/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/16/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/2199 <br /> Total Purgeable Hydrocarbons (C6-C12),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov, Limits % Limit % Notes* <br /> Batch: 9020200 Date Prepared: 2118199 Extraction Method: EPA 5030B(MeOH) <br /> Blank 2QZ0200-RLKI <br /> Purgeable Hydrocarbons 2/18/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Methyl tert-butyl ether ND 0.0500 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.169 60.0-140 84.5 <br /> LSS 9020200-BS 1 <br /> Benzene 2/18199 0.200 0.185 mg/kg 70.0-130 92.5 <br /> Toluene 0.200 0.188 70.0-130 94.0 <br /> Ethylbenzene 0.200 0.188 70.0-130 94.0 <br /> lens(total) 0.600 0.570 70.0-130 95.0 <br /> hyl tert-butyl ether 0.200 0.178 70.0-130 89.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.180 60.0-140 90.0 <br /> Matrix Spike 9020200-MSI 5902232-02 <br /> Benzene 2/18/99 0.200 ND 0.172 mg/kg 60.0-140 86.0 <br /> Toluene 0.200 ND 0.241 60.0-140 120 <br /> Ethylbenzene 0.200 ND 0.179 60.0-140 89.5 <br /> Xylenes(total) 0.600 ND 0.547 60.0-140 91.2 <br /> Methyl tert-butyl ether 0.200 ND 0.206 60.0-140 103 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0.188 60.0-140 94.0 <br /> Matrix Spike Dun 9020200-MSD1 S902232-02 <br /> Benzene 2/18/99 0.200 ND 0.170 mg/kg 60.0-140 85.0 25.0 1.17 <br /> Toluene 0.200 ND 0.206 60.0-140 103 25.0 15.2 <br /> Ethylbenzene 0.200 ND 0.177 60.0-140 88.5 25.0 1.12 <br /> Xylenes(total) 0.600 ND 0.542 60.0-140 90.3 25.0 0.992 <br /> Methyl tert-butyl ether 0.200 ND 0.175 60.0-140 87.5 25.0 16.3 <br /> Surrogate: a,a,a-Trifluorololuene 0.200 0.187 60.0-140 93.5 <br /> Hates 9020225 te,Prepared: 2/18/99 Extraction Method: EPA 5030B(MeOH) <br /> Blank 9020225-BLK1 <br /> Purgeable Hydrocarbons 2/18/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> thy/tert-butyl ether ND 0.0500 <br /> equoia Analytical -Sacramento *Refer to end of report for text of nates and definitions. <br /> /4,,i�eesRcpr�escntative <br /> Sandra R. HansonCliePage 9 of 15 <br />